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637:, released in early 2003. It compresses an audio CD to a range of 206 to 411 MB, at bit rates of 470 to 940 kbit/s. The result is a bit-for-bit duplicate of the original audio file; in other words, the audio quality on the CD will be the same as the file when played back. WMA Lossless uses the same .WMA file extension as other Windows Media Audio formats. It supports 6 discrete channels and up to 24-bit/96 kHz lossless audio. The format has never been publicly documented, although an open-source decoder has been reverse-engineered for non-Microsoft platforms by the
615:
484:
of those used in Ogg and AAC such that WMA iMDCT and windowing routines can be used to decode AAC and Ogg Vorbis almost unmodified. However, quantization and stereo coding is handled differently in each codec. The primary distinguishing trait of the WMA Standard format is its unique use of 5 different block sizes, compared to MP3, AAC, and Ogg Vorbis which each restrict files to just two sizes. WMA Pro extends this by adding a 6th block size used at 88.2/96 kHz sampling rate.
761:, and other codecs. Designed for low-bandwidth, voice playback applications, it employs low-pass and high-pass filtering of sound outside the human speech frequency range to achieve higher compression efficiency than WMA. It can automatically detect sections of an audio track containing both voice and music and use the standard WMA compression algorithm instead. WMA Voice supports up to 22.05 kHz for a single channel (mono) only. Encoding is limited to
464:. The bit stream of WMA is composed of superframes, each containing 1 or more frames of 2048 samples. If the bit reservoir is not used, a frame is equal to a superframe. Each frame contains several blocks, which are 128, 256, 512, 1024, or 2048 samples long after being transformed into the frequency domain via the MDCT. In the frequency domain, masking for the transformed samples is determined, and then used to requantize the samples. Finally, the
522:(WMA Pro) is an improved lossy codec closely related to WMA standards. It retains most of the same general coding features, but also features improved entropy coding and quantization strategies as well as more efficient stereo coding. Notably, many of the WMA standard's low bitrate features have been removed, as the core codec is designed for efficient coding at most bitrates. Its main competitors include
542:, which reduces the volume difference between the loudest and quietest sounds in the audio track. According to Microsoft's Amir Majidimehr, WMA Pro could theoretically go beyond 7.1 surround sound and support "an unlimited number of channels"; however, Microsoft chose to limit its current capability to eight (7.1 discrete channels).
691:.) Designed for archival purposes, it compresses audio signals without loss of quality from the original using VBR. When decompressed, the audio signal is an exact replica of the original. The first version of the codec, WMA 9 Lossless, and its revisions support up to 96 kHz, 24-bit audio for up to 6 discrete channels (
394:
Each WMA file features a single audio track in one of the four sub-formats: WMA, WMA Pro, WMA Lossless, or WMA Voice. These formats are implemented differently from one another, such that they are technically distinct and mutually incompatible; that is to say, a device or software compatible with one
729:
Insignia NS-DV, Pilot, and Sport music players. The
Logitech Squeezebox Touch now supports the format natively despite previously only supporting it via transcoding. Like WMA Standard, WMA Lossless is being used by a few online stores to distribute music online. Similar to WMA Pro, the WMA Lossless
554:
encoding options. A WMA 10 Pro file compressed with frequency interpolation mode comprises a WMA 9 Pro track encoded at half the original sampling rate, which is then restored using a new compression algorithm. In this situation, WMA 9 Pro players which have not been updated to the WMA 10 Pro codec
483:
Like AAC and Ogg Vorbis, WMA was intended to address perceived deficiencies in the MP3 standard. Given their common design goals, the three formats ended up making similar design choices. All three are pure transform codecs. Furthermore, the MDCT implementation used in WMA is essentially a superset
300:
All versions of WMA released since version 9.0 – namely 9.1, 9.2, and 10 – have been backwards compatible with the original v9 decoder and are therefore not considered separate codecs. The sole exception to this is the WMA 10 Professional codec whose Low Bit Rate (LBR)
912:
Microsoft's claims of WMA sound quality have frequently drawn complaints. "Some audiophiles challenge
Microsoft's claims regarding WMA's quality", according to a published article from EDN. Another article from MP3 Developments wrote that Microsoft's claim about CD-quality audio at 64 kbit/s
850:
in 1999. Out of 300 participants, "71% of all listeners indicated that WMA Pro was equal to or better than HE AAC." However, a
September 2003 public listening test conducted by Roberto Amorim found that listeners preferred 128 kbit/s MP3 to 64 kbit/s WMA audio with greater than 99%
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The WMA codecs are most often used with the ASF container format, which has an optional DRM facility. Windows Media DRM, which can be used in conjunction with WMA, supports time-limited music subscription services such as those offered by unlimited download services, including MTV's
800:
listening tests with other lossy audio codecs have shown varying results, from failure to support
Microsoft's claims about its superior quality to supremacy over other codecs. One independent test conducted in May 2004 at 128 kbit/s showed that WMA was roughly equivalent to
241:, as part of Windows Media Technologies 4.0. Microsoft claimed that WMA could produce files that were half the size of equivalent-quality MP3 files; Microsoft also claimed that WMA delivered "near CD-quality" audio at 64 kbit/s. The former claim however was rejected by some
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project further extended this codec to be suitable for embedded cores, allowing playback on portable MP3 players and cell phones running open source software. RealNetworks has announced plans to support playback of DRM-free WMA files in RealPlayer for Linux. On the
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mode is only backwards compatible with the older WMA Professional decoders at a half sampling rate (similar to how HE-AAC is backwards compatible with AAC-LC). Full fidelity decoding of WMA 10 Professional LBR bitstreams requires a WMA version 10 or newer decoder.
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can only decode the lower quality WMA 9 Pro stream. Starting with WMA 10 Pro, eight channel encoding starts at 128 kbit/s, and tracks can be encoded at the native audio CD resolution (44.1 kHz, 16-bit), previously the domain of WMA Standard.
967:(with certain limitations—DSP plugin support and DirectSound output is disabled using the default WMA plugin), and many other software media players. The Microsoft Zune media management software supports most WMA codecs, but uses a variation of
418:, was altered in minor ways and became WMA 2. Since then, newer versions of the codec have been released, but the decoding process remained the same, ensuring compatibility between codec versions. WMA is a lossy audio codec based on the study of
512:
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has promoted the codec as an alternative to WMA for copying audio CD tracks. WMA Pro is supported in
Silverlight as of version 2 (though only in stereo mode). In the absence of the appropriate audio hardware, WMA Pro can automatically
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HE-AAC and better than WMA 9.2 in an independent listening test organized and supported by
Sebastian Mares and Hydrogenaudio Forums in December 2006. This test, however, used CBR for WMA 10 Pro and VBR for the other
913:
with WMA was "very far from the truth". At the early stages of WMA's development, a representative from RealNetworks claimed that WMA was a "clear and futile effort by
Microsoft to catch up with RealAudio 8".
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The codec's bit stream syntax was frozen at the first version, WMA 9 Pro. Later versions of WMA Pro introduced low-bit rate encoding, low-delay audio, frequency interpolation mode, and an expanded range of
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played WMA files, support for WMA file creation was not added until the seventh version. In 2003, Microsoft released new audio codecs that were not compatible with the original WMA codec. These codecs were
795:
Microsoft claims that audio encoded with WMA sounds better than MP3 at the same bit rate; Microsoft also claims that audio encoded with WMA at lower bit rates sound better than MP3 at higher bit rates.
888:, there was a four-way tie between aoTuV Vorbis, LAME MP3, WMA 9 Pro and AAC in a large scale test in January 2006, with each codec sounding close to the uncompressed music file for most listeners.
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410:, especially in marketing materials and device specifications, usually refers to this codec only. The first version of the codec released in 1999 is regarded as WMA 1. In the same year, the
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component that allows
Macintosh users to play WMA files in any player that uses the QuickTime framework. Flip4Mac, however, does not currently support the Windows Media Audio Voice codec.
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projects have open source WMA Lossless decoders based on reverse engineering of the official decoder. Only 16-bit WMA files can be successfully decoded by ffmpeg as of June 20, 2012.
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Despite a growing number of supported devices and its superiority over WMA, WMA Pro still has little hardware and software support. Some notable exceptions to this are the
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441:(ABR) coding techniques into the MS encoder although both were technically supported by the original format. WMA 9.1 also added support for low-delay audio, which reduces
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Microsoft has sometimes claimed that the sound quality of WMA at 64 kbit/s equals or exceeds that of MP3 at 128 kbit/s (both WMA and MP3 are considered near-
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1393:"Microsoft Windows Media Technologies Gains Support for Downloadable Music from Top Music Sites, Independent Labels, Popular Bands And Innovative Developers"
725:-powered devices with Windows Media Player 10 Mobile, Windows Phone (version 8 and above), Toshiba Gigabeat S and V models, Toshiba T-400, the Meizu M3, and
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A notable example of WMA Pro being used instead of WMA Standard is the NBC Olympics website which uses WMA 10 Pro in its low-bitrate mode at 48 kbit/s.
225:
and his team which was transferred to the
Windows Media team at Microsoft. Malvar was a senior researcher and manager of the Signal Processing Group at
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534:, Dolby Digital, and DTS. It supports 16-bit and 24-bit sample bit depth, sampling rates up to 96 kHz, and up to eight discrete channels (
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Both MP3 and WMA encoders have undergone active development and improvement for many years, so their relative quality may change over time.
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820:, WMA Standard was noticeably better than LAME MP3, but not better than other modern codecs in a collective, independent test in July 2004.
480:(typically less than 17 kbit/s) and a form of noise coding (typically less than 33 kbit/s) can also be used to improve quality.
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422:. Audio signals that are deemed to be imperceptible to the human ear are encoded with reduced resolution during the compression process.
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and most commonly used for Smooth
Streaming, a form of adaptive bitrate streaming over HTTP. Related industry standards such as DECE
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have not standardized WMA as a supported audio codec, deciding in favor of the more industry-prevalent MPEG and Dolby audio codecs.
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885:
495:, support the playback of WMA files. Most PlaysForSure-certified online stores distribute content using this codec only. In 2005,
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Windows Mobile-powered devices with Windows Media Player 10 Mobile have native support for WMA 9 Voice playback. In addition,
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announced its plans to support WMA playback in future Nokia handsets. In the same year, an update was made available for the
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Since 2008 Microsoft has also been using WMA Professional in its Protected Interoperable File Format (PIFF) based on the
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Screenshot of Windows Media Encoder 9 Series, displaying new encoding options for Windows Media Audio 10 Professional.
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846:, WMA Pro outperformed Nero HE-AAC in a listening test commissioned by Microsoft but independently performed by the
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devices, as well as a large number of uncertified devices, ranging from portable hand-held music players to set-top
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sub-format does not therefore automatically support any of the other codecs. Each codec is further explained below.
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codec), later being removed in Windows Vista with the addition of Media Foundation. Although earlier versions of
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software packages that can export audio in WMA format, including amongst many others Windows Media Player,
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in 2003, but further development of the software has ceased. Microsoft currently endorses the third-party
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in 2003. Microsoft first announced its plans to license WMA technology to third parties in 1999. Prior to
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924:(NSTL) found that listeners preferred WMA at 64 kbit/s to MP3 at 128 kbit/s (as encoded by
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2780:"RealPlayer Customer Support: What formats can I use to record tracks from a CD with RealPlayer?"
1132:. Players that support the WMA format but not Windows Media DRM cannot play DRM-protected files.
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Label for 5.1 surround sound, the maximum channel configuration for Windows Media Audio Lossless.
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also challenged Microsoft's claims regarding WMA's superior audio quality compared to RealAudio.
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1901:"Voices: Microsoft's Amir Majidimehr: a window to the world of digital media - 11-23-2006 - EDN"
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This article is about audio encoding and decoding software. For the container file format, see
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tags used by MP3 files. Metadata may include song name, track number, artist name, and also
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explained that Xbox Live uses Speex for voice compression in the June 6, 2005 interview on
1710:"Microsoft and Nokia Collaborate to Help Ensure Consumers Can Enjoy Digital Music Anywhere"
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decoder can perform downmixing when capable audio hardware is not present. As of 2012, the
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Apart from Windows Media Player, most of the WMA compression formats can be played using
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framework. WMA consists of four distinct codecs. The original WMA codec, known simply as
2093:"Verizon Wireless Chooses Microsoft Windows Media to Power Its New V CAST Music Service"
1018:
does not itself support WMA, but there is third-party WMA software for Android devices.
765:(CBR) and up to 20 kbit/s. The first and only version of the codec is WMA 9 Voice.
406:(WMA) is the most common codec of the four WMA codecs. The colloquial usage of the term
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WMA format can be played on almost all Windows Mobile and later Windows Phone devices.
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project has reverse-engineered and re-implemented the WMA codecs to allow their use on
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503:(version 2.60) which allowed WMA files to be played on the device for the first time.
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1191:"Windows Media Technologies 4 Delivers Cutting-Edge CD-Quality Audio On the Internet"
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in October 2003. The test sample was a 48 kHz, 5.1 channel surround audio track.
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samples are decomposed into coefficient and exponent parts and independently
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at 192 kbit/s by most listeners). In a 1999 study funded by Microsoft,
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276:, WMA files were primarily streamed using the Windows Media Source Filter (
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2312:"What is Windows Audio Endpoint Builder service And How To Start/Stop It"
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1792:"Paul Thurrott's SuperSite for Windows: Windows Media 9 Series reviewed"
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2001:"Motorola and Microsoft Plan to Bring More Choice to Mobile Music Fans"
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Hardware support for the codec is available on the Cowon A3, Cowon S9,
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2179:"After seven years, Apple open sources its Apple Lossless Audio Codec"
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877:, and Vorbis; near-equivalent quality to MP3, and better quality than
197:, targeted at voice content, applies compression using a range of low
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1585:"Microsoft Wins Major ISV Support for Windows Media Technologies 4.0"
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some audiophiles challenge Microsoft's claims regarding WMA's quality
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alternative firmware. In addition, WMA Pro is a requirement for the
2856:"General information about the audio functionality in OneNote 2003"
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2502:"Results of Multiformat at 128 kbit/s public Listening Test"
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1767:"Windows Media Audio Codecs: Windows Media Audio 9 Professional"
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supports all available bit rate and resolution options as well.
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project. The first finalized codec was initially referred to as
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2712:"Important information for Windows Media Player for Mac users"
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2032:"Motorola Dis Apple, Expect More Microsoft Music Phones: 3GSM"
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683:(Since late 2011, the last three have the advantage of being
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and both claims have been refuted through publicly-available
2243:"Windows Media Audio Codecs: Windows Media Audio 9 Lossless"
651:(WMA Lossless) is a lossless audio codec that competes with
570:-powered devices with Windows Media Player 10 Mobile, newer
1289:"Windows Media 9 Series Capabilities and Benefits Overview"
2124:"Windows Vista Features Explained Windows Media Player 11"
2427:"Windows Media Audio Codecs: Windows Media Audio 9 Voice"
713:, Zune 120 (with firmware version 2.2 or later) and the
1291:. International Narcotics Control Board. Archived from
1155:– an image file format and codec developed by Microsoft
1144:– a video file format and codec developed by Microsoft
749:(WMA Voice) is a lossy audio codec that competes with
590:
utilizes WMA 10 Pro for its V CAST Music Service, and
425:
WMA can encode audio signals sampled at up to 48
1469:
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1368:"Communication, Collaboration, and Signal Processing"
1112:. Windows Media DRM, a component of PlaysForSure and
315:
A WMA file is in most circumstances contained in the
1560:"Microsoft Releases Windows Media Audio and Video 8"
578:
devices, and devices running recent versions of the
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2148:"Welcome to the Apple Lossless Audio Codec Project"
1217:"Microsoft readies MP3-killer digital music format"
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for a table of double-blind listening test results.
603:, and 24-bit resolution to 16-bit during playback.
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2736:"Flip4Mac forum post discussing WMA Voice support"
2210:"Apple open sources its ALAC lossless audio codec"
1535:"Microsoft Announces Windows Media Technologies 7"
805:MP3; inferior to AAC and Vorbis; and superior to
448:Fundamentally, WMA is a transform coder based on
2793:Supported file formats in Adobe Premiere Pro 2.0
339:about the file is to be encoded, similar to the
2652:"Real to plug Windows media support into Linux"
1971:
1969:
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161:, was conceived as a competitor to the popular
1814:
1812:
1660:"The Difference Between ASF and WMV/WMA Files"
1185:
1183:
702:Serenata Sony Walkman NWZ-A and NWZ-S series,
347:values. This container can optionally support
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2813:"Supported file formats (Adobe Audition 2.0)"
2762:"Three Methods of How to Play WMA on Android"
1926:"Zune.net: How-To - Provide Content for Zune"
1685:"Windows Media Format 11 SDK Low-Delay Audio"
1635:"SuperSite for Windows Media Player 7 Review"
586:certification program. On the software side,
8:
173:, a newer and more advanced codec, supports
37:
1876:"Best Practices for Windows Media Encoding"
1504:
1502:
1500:
1498:
4217:
4004:
3404:
2934:
2903:
2889:
2881:
2547:. streamingmedia.com Codec. Archived from
2286:"Comparison of lossless audio compressors"
2268:"ExtremeTech Audio Codec Quality Shootout"
1941:
1939:
1820:"Windows Media Audio & Video 9 Series"
1610:"Windows Media Source Filter - Win32 apps"
1073:supports encoding in all WMA codecs, and
335:. The ASF container format specifies how
2626:"Media Player Classic - Player Features"
1447:"MS Windows Media Technologies Features"
256:Newer versions of WMA became available:
2838:"Soundbooth CS3 supported file formats"
2366:"Online Stores in Windows Media Player"
1251:"Analysis of the Microsoft Audio Codec"
1179:
629:incarnation of Windows Media Audio, an
2208:von Eitzen, Chris (October 28, 2011).
922:National Software Testing Laboratories
237:. It was later officially released as
36:
2688:"Windows Media Player 9 for Mac OS X"
2650:Shankland, Stephen (17 August 2006).
2189:from the original on October 29, 2011
1587:. Microsoft PressPass. Archived from
1395:. Microsoft PressPass. Archived from
1193:. Microsoft PressPass. Archived from
982:-compliant operating systems such as
873:, WMA had lower quality than HE-AAC,
834:, WMA 10 Pro was ranked second after
359:block cipher, a custom block cipher,
7:
2177:Foresman, Chris (October 28, 2011).
1510:"Broadcom Corporation: Audio Codecs"
1370:. Microsoft Research. Archived from
1345:. Microsoft Research. Archived from
999:version of Windows Media Player for
2876:Windows Media homepage at Microsoft
2452:"Roku - SoundBridge Internet Radio"
1449:. Microsoft TechNet. Archived from
4694:Comparison of audio coding formats
2668:from the original on 24 April 2016
2158:from the original on June 15, 2016
1855:from the original on 17 April 2008
1169:Comparison of audio coding formats
472:. Stereo information is typically
450:modified discrete cosine transform
429:with up to two discrete channels (
287:Windows Media Audio 9 Professional
153:technology that forms part of the
25:
2545:"Codec Rivalry Spurs Development"
2154:. MacOS Forge. October 27, 2011.
1977:"Windows Media Player Mobile FAQ"
1475:"The Internet-audio (r)evolution"
881:in individual tests done in 2005.
201:. Microsoft has also developed a
27:Audio data compression technology
2862:from the original on 2007-10-24.
2844:from the original on 2007-10-15.
2724:from the original on 2007-08-22.
2700:from the original on 2007-08-21.
2569:Microsoft's summary of the study
2489:from the original on 2006-04-15.
2378:from the original on 2007-07-27.
2348:"Is This Digital Music's Future"
2274:from the original on 2011-06-07.
2136:from the original on 2007-09-13.
2063:from the original on 2011-01-06.
1989:from the original on 2007-09-14.
1932:from the original on 2007-08-19.
1316:Hinchberger, Bill (2001-09-09).
599:multichannel audio to stereo or
520:Windows Media Audio Professional
507:Windows Media Audio Professional
2632:from the original on 2011-08-16
2526:from the original on 2007-08-15
2433:from the original on 2007-09-01
2405:from the original on 2007-10-14
2249:from the original on 2007-09-01
1947:"Spring '07 Video Playback FAQ"
1773:from the original on 2007-09-01
1691:from the original on 2007-10-24
1666:from the original on 2007-08-19
1566:from the original on 2007-09-26
1257:from the original on 2007-08-18
1229:from the original on 2008-03-21
1029:There are many proprietary and
995:platform, Microsoft released a
971:which is used by PlaysForSure.
772:has employed WMA Voice for its
209:to store audio encoded by WMA.
4256:ISO/IEC base media file format
1419:"MS Audio 4.0 will eat MP3..."
899:in a comparative test done by
848:National Software Testing Labs
623:Windows Media Audio 9 Lossless
291:Windows Media Audio 9 Lossless
1:
2399:"Linux radio show - LugRadio"
2329:http://www.serenatamobile.com
1633:Thurrott, Paul (2005-04-30).
1417:Barry, Richard (1999-04-14).
687:and available for nearly any
351:(DRM) using a combination of
221:was based on earlier work by
4750:Microsoft proprietary codecs
1740:Carnoy, David (2005-03-23).
1343:"Press Kit: Henrique Malvar"
1039:Microsoft Expression Encoder
908:Criticism of claimed quality
649:Windows Media Audio Lossless
610:Windows Media Audio Lossless
452:(MDCT), somewhat similar to
2760:Cooper (27 February 2023).
1537:. Microsoft. Archived from
445:for encoding and decoding.
353:elliptic curve cryptography
295:Windows Media Audio 9 Voice
229:, whose team worked on the
4771:
4699:Comparison of video codecs
3209:(GB/T 33475.2,GY/T 299.1)
2152:Apple Lossless Audio Codec
1874:Smith, Tony (2007-02-21).
1215:Smith, Tony (1999-03-12).
1084:
376:ISO Base Media File Format
308:
29:
4712:
1164:Timeline of audio formats
1081:Digital rights management
753:(used in Microsoft's own
747:Windows Media Audio Voice
742:Windows Media Audio Voice
540:dynamic range compression
538:). WMA Pro also supports
476:coded. At low bit rates,
371:for further information.
349:digital rights management
1318:"Riding the Malvar Wave"
1071:Microsoft Office OneNote
812:Some studies concluded:
203:digital container format
141:and their corresponding
56:Internet media type
4523:Alliance for Open Media
2601:"VLC playback Features"
592:Windows Media Player 11
317:Advanced Systems Format
311:Advanced Systems Format
207:Advanced Systems Format
3443:MPEG-1 Layer III (MP3)
2477:"Windows Media: Music"
2057:"New WMA Audio Codecs"
1106:Yahoo! Music Unlimited
619:
516:
367:hashing function. See
363:stream cipher and the
80:; 25 years ago
4461:QuickTime File Format
2580:Full report from NSTL
2520:"Lossy Audio Formats"
1114:Windows Media Connect
1075:Windows Media Encoder
617:
562:(limited to stereo),
514:
416:compression algorithm
270:Windows Media Audio 9
266:Windows Media Audio 8
262:Windows Media Audio 7
258:Windows Media Audio 2
247:codec listening tests
179:high-resolution audio
4720:Compression software
4277:MPEG media transport
3354:Sorenson Video/Spark
2310:Tushar (July 2019).
949:Media Player Classic
809:(software version).
788:codec listening test
693:5.1 channel surround
685:open source software
536:7.1 channel surround
501:PlayStation Portable
433:). WMA 9 introduced
282:Windows Media Player
143:audio coding formats
78:August 17, 1999
4718:for techniques and
4716:Compression methods
3212:HDR Vivid(GY/T 358)
2522:. MP3Developments.
1849:msdn2.microsoft.com
1142:Windows Media Video
1035:Windows Movie Maker
776:streaming service.
661:DTS-HD Master Audio
655:Advanced Lossless,
478:line spectral pairs
404:Windows Media Audio
399:Windows Media Audio
345:audio normalization
239:Windows Media Audio
213:Development history
131:Windows Media Audio
39:
38:Windows Media Audio
4745:Audio file formats
2798:2007-10-13 at the
2585:2007-11-28 at the
2574:2007-10-24 at the
2334:2007-09-30 at the
1687:. Microsoft MSDN.
1614:docs.microsoft.com
1153:JPEG XR / HD Photo
1055:Adobe Premiere Pro
926:MusicMatch Jukebox
865:2014-07-08 at the
830:2014-07-08 at the
700:Bang & Olufsen
620:
517:
227:Microsoft Research
44:Filename extension
4727:
4726:
4501:
4500:
4419:DivX Media Format
4207:
4206:
3992:
3991:
3392:
3391:
3282:Microsoft Video 1
3217:AVS3 P2(GY/T 368)
3203:(GB/T 20090.2/16)
2500:Amorim, Roberto.
1845:"Low-Delay Audio"
1742:"Sony PSP review"
1087:Windows Media DRM
969:Windows Media DRM
770:BBC World Service
763:constant bit rate
757:online service),
435:variable bit rate
369:Windows Media DRM
137:) is a series of
128:
127:
65:Developed by
16:(Redirected from
4762:
4493:VOB, IFO and BUP
4267:Motion JPEG 2000
4218:
4005:
3964:aptX Low Latency
3741:Chinese Standard
3405:
3194:Chinese Standard
2966:Motion JPEG 2000
2935:
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2898:
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2882:
2864:
2863:
2852:
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2824:
2815:. Archived from
2809:
2803:
2790:
2784:
2783:
2776:
2770:
2769:
2757:
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2748:
2747:
2738:. Archived from
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1744:. Archived from
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1718:. Archived from
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1313:
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1297:
1285:
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1253:. RealNetworks.
1247:
1238:
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1235:
1234:
1212:
1206:
1205:
1203:
1202:
1187:
1067:VLC media player
1063:Adobe Soundbooth
1043:Sony Sound Forge
1016:Android platform
945:VLC media player
689:operating system
572:Toshiba Gigabeat
439:average bit rate
325:container format
305:Container format
121:
108:
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3999:
3988:
3784:
3756:(GB/T 33475.3)
3750:(GB/T 20090.10)
3736:
3713:
3685:
3627:
3589:
3504:
3500:MPEG-H 3D Audio
3426:MPEG-1 Layer II
3416:
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2662:CBS Interactive
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2599:VideoLAN team.
2598:
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2587:Wayback Machine
2576:Wayback Machine
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2388:Ralph Giles of
2387:
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2345:
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2336:Wayback Machine
2327:
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2316:techcaption.com
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893:768 kbit/s
886:128 kbit/s
867:Wayback Machine
832:Wayback Machine
782:
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612:
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420:psychoacoustics
401:
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223:Henrique Malvar
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75:Initial release
50:
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4704:List of codecs
4701:
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4690:
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4506:Collaborations
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4272:MPEG-21 Part 9
4269:
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4261:MPEG-4 Part 14
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3841:Monkey's Audio
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3813:
3808:
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3781:(SJ/T 11299.4)
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3438:MPEG-1 Layer I
3435:
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3044:Part 2 / LCEVC
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3019:
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2871:
2870:External links
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2804:
2785:
2771:
2752:
2727:
2703:
2679:
2642:
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2591:
2561:
2536:
2511:
2508:on 2009-01-23.
2492:
2468:
2443:
2415:
2381:
2357:
2354:on 2007-07-15.
2339:
2321:
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2277:
2259:
2231:
2220:on 15 May 2012
2200:
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1421:Archived from
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1159:Surround sound
1156:
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1110:Virgin Digital
1085:Main article:
1082:
1079:
1059:Adobe Audition
1026:
1023:
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871:96 kbit/s
860:80 kbit/s
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840:
825:48 kbit/s
821:
818:32 kbit/s
793:
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781:
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774:Internet radio
743:
740:
723:Windows Mobile
677:Apple Lossless
669:Monkey's Audio
611:
608:
568:Windows Mobile
560:Microsoft Zune
508:
505:
466:floating point
400:
397:
391:
388:
355:key exchange,
309:Main article:
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217:The first WMA
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183:lossless codec
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93:Type of format
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60:audio/x-ms-wma
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3719:Bluetooth SIG
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3465:MPEG Surround
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3016:
3015:Part 2 / HEVC
3013:
3012:
3011:
3008:
3004:
3003:Part 33 / IVC
3001:
2999:
2998:Part 10 / AVC
2996:
2994:
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2990:
2989:
2986:
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2877:
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2869:
2861:
2857:
2851:
2848:
2843:
2839:
2833:
2830:
2819:on 2007-10-15
2818:
2814:
2808:
2805:
2801:
2797:
2794:
2789:
2786:
2781:
2775:
2772:
2767:
2763:
2756:
2753:
2742:on 2009-07-01
2741:
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2646:
2643:
2631:
2627:
2621:
2618:
2607:on 2010-01-03
2606:
2602:
2595:
2592:
2588:
2584:
2581:
2577:
2573:
2570:
2565:
2562:
2551:on 2007-10-15
2550:
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2540:
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2521:
2515:
2512:
2507:
2503:
2496:
2493:
2488:
2484:
2483:
2478:
2472:
2469:
2458:on 2007-08-16
2457:
2453:
2447:
2444:
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2429:. Microsoft.
2428:
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2292:on 2010-11-25
2291:
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2248:
2245:. Microsoft.
2244:
2238:
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2170:
2157:
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2143:
2140:
2135:
2131:
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2125:
2119:
2116:
2105:on 2007-06-15
2104:
2100:
2099:
2094:
2088:
2085:
2080:
2076:
2070:
2067:
2062:
2058:
2052:
2049:
2038:on 2007-09-27
2037:
2033:
2027:
2024:
2013:on 2007-10-24
2012:
2008:
2007:
2002:
1996:
1993:
1988:
1984:
1983:
1978:
1972:
1970:
1968:
1964:
1953:on 2008-02-13
1952:
1948:
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1940:
1936:
1931:
1927:
1921:
1918:
1907:on 2007-04-30
1906:
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1882:on 2007-08-31
1881:
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1826:on 2007-09-28
1825:
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1809:
1798:on 2007-05-28
1797:
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1772:
1769:. Microsoft.
1768:
1762:
1759:
1748:on 2007-08-10
1747:
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1733:
1722:on 2007-08-31
1721:
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1662:. Microsoft.
1661:
1655:
1652:
1641:on 2007-08-18
1640:
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1611:
1605:
1602:
1591:on 2007-09-12
1590:
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1565:
1561:
1555:
1552:
1541:on 2007-10-24
1540:
1536:
1530:
1527:
1516:on 2007-06-08
1515:
1511:
1505:
1503:
1501:
1499:
1495:
1491:
1481:on 2007-10-10
1480:
1476:
1470:
1468:
1464:
1453:on 2007-10-24
1452:
1448:
1442:
1440:
1436:
1425:on 2007-09-30
1424:
1420:
1413:
1410:
1399:on 2007-10-24
1398:
1394:
1388:
1385:
1374:on 2007-07-17
1373:
1369:
1363:
1360:
1349:on 2007-08-25
1348:
1344:
1338:
1335:
1324:on 2007-10-13
1323:
1319:
1312:
1309:
1298:on 2007-09-28
1294:
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1197:on 2007-10-24
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965:Zune Software
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780:Sound quality
779:
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548:sampling rate
543:
541:
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498:
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470:huffman coded
467:
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333:digital video
330:
329:digital audio
326:
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279:
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268:in 2001, and
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155:Windows Media
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4740:Audio codecs
3943:
3770:(GB/T 22726)
3431:Multichannel
3287:MSU Lossless
3201:AVS1 P2/AVS+
3155:TrueMotion S
3093:H.265 / HEVC
3039:Part 1 / EVC
3027:Part 3 / VVC
2993:Part 2 / ASP
2850:
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2183:Ars Technica
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1222:The Register
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1195:the original
1090:
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798:Double blind
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657:Dolby TrueHD
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489:PlaysForSure
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251:RealNetworks
238:
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230:
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194:
187:WMA Lossless
186:
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170:
158:
139:audio codecs
134:
130:
129:
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4048:HEIC / HEIF
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3490:MPEG-4 CELP
3485:MPEG-4 HVXC
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3232:Apple Video
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2224:October 29,
2193:October 29,
2162:October 29,
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4734:Categories
4722:for codecs
4669:Daubechies
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4546:Arithmetic
4213:Containers
3918:True Audio
3762:(GY/T 363)
3480:MPEG-4 DST
3475:MPEG-4 SLS
3470:MPEG-4 ALS
3344:SheerVideo
3318:QuickTime
3146:TrueMotion
2912:Multimedia
2823:2007-08-08
2746:2010-01-26
2636:2011-08-17
2611:2010-01-03
2555:2007-08-16
2530:2007-08-16
2462:2007-08-08
2437:2007-08-16
2409:2007-10-10
2296:2010-11-25
2253:2007-08-16
2109:2018-12-06
2042:2007-08-08
2017:2018-12-06
1957:2007-08-08
1911:2007-06-07
1886:2007-08-16
1830:2007-08-08
1802:2007-06-24
1777:2007-08-16
1752:2007-08-16
1726:2007-08-15
1695:2007-08-16
1670:2007-08-16
1645:2007-08-16
1619:2021-11-30
1595:2007-08-16
1570:2007-08-16
1562:. CDRInf.
1545:2007-08-16
1520:2007-05-30
1485:2007-08-16
1457:2007-08-16
1429:2007-08-16
1403:2007-08-16
1378:2007-08-16
1353:2007-08-16
1328:2007-08-16
1302:2007-08-16
1261:2007-08-16
1233:2007-08-16
1201:2007-08-16
1175:References
1051:RealPlayer
1047:GOM Player
957:RealPlayer
853:confidence
727:Best Buy's
645:projects.
487:Certified
437:(VBR) and
412:bit stream
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278:DirectShow
274:Windows XP
149:. It is a
85:1999-08-17
4471:RealMedia
4073:JPEG 2000
3876:RealAudio
3856:OptimFROG
3334:RealVideo
3322:Animation
3292:OMS Video
2919:container
2766:WonderFox
2717:Microsoft
2693:Microsoft
2482:Microsoft
2371:Microsoft
2129:Microsoft
2098:Microsoft
2006:Microsoft
1982:Microsoft
1715:Microsoft
1014:The core
1009:QuickTime
993:Macintosh
941:ALLPlayer
755:Xbox Live
704:Zune 4, 8
635:Microsoft
552:bit-depth
384:MPEG-DASH
319:(ASF), a
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260:in 1999,
199:bit rates
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4590:Lossless
4556:Modified
4449:Matroska
4328:Matroska
4239:MPEG-PES
3851:Musepack
3748:AVS1 P10
3327:Graphics
3277:Lagarith
2860:Archived
2842:Archived
2796:Archived
2722:Archived
2698:Archived
2666:Archived
2630:Archived
2583:Archived
2572:Archived
2524:Archived
2487:Archived
2431:Archived
2403:Archived
2394:LugRadio
2390:Xiph.org
2376:Archived
2332:Archived
2272:Archived
2247:Archived
2187:Archived
2156:Archived
2134:Archived
2061:Archived
1987:Archived
1930:Archived
1859:30 April
1853:Archived
1771:Archived
1689:Archived
1664:Archived
1564:Archived
1255:Archived
1227:Archived
1136:See also
1126:Xbox 360
1102:Rhapsody
1025:Encoders
1005:Flip4Mac
1001:Mac OS X
863:Archived
828:Archived
719:Xbox 360
627:lossless
576:Motorola
564:Xbox 360
474:mid/side
337:metadata
169:codecs.
4664:Wavelet
4605:DEFLATE
4551:Huffman
4541:Entropy
4533:Methods
4518:MPEG LA
4407:Smacker
4295:H.222.0
4251:MPEG-TS
4246:MPEG-PS
4234:MPEG-ES
4118:TIFF/IT
4113:TIFF/EP
4098:JPEG XT
4093:JPEG XS
4088:JPEG XR
4083:JPEG XL
4078:JPEG-LS
3959:aptX HD
3939:WavPack
3881:RTAudio
3821:Codec 2
3754:AVS2 P3
3681:GSM-EFR
3651:AMR-WB+
3585:G.729.1
3565:G.723.1
3555:G.722.2
3550:G.722.1
3349:Smacker
3339:RTVideo
3267:Huffyuv
3247:Cinepak
3207:AVS2 P2
2921:formats
2672:5 April
1098:Napster
1007:WMA, a
997:PowerPC
988:Rockbox
953:MPlayer
935:Players
839:codecs.
715:Zune HD
681:WavPack
665:Shorten
597:downmix
588:Verizon
580:Rockbox
443:latency
231:MSAudio
205:called
171:WMA Pro
83: (
18:WMA Pro
4466:RatDVD
4360:Others
4127:Others
3929:VMR-WB
3924:TwinVQ
3789:Others
3676:GSM-FR
3671:GSM-HR
3661:EVRC-B
3646:AMR-WB
3618:Vorbis
3458:AAC-LD
3453:HE-AAC
3359:Theora
3302:ProRes
3297:Pixlet
3225:Others
3034:MPEG-5
3022:MPEG-I
3010:MPEG-H
2988:MPEG-4
2981:Part 2
2976:MPEG-2
2971:MPEG-1
2075:"Info"
1128:, and
1108:, and
1065:, and
986:. The
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961:Winamp
875:AAC-LC
807:ATRAC3
732:ffmpeg
679:, and
643:ffmpeg
584:WMV HD
532:Vorbis
528:HE-AAC
462:Vorbis
431:stereo
390:Codecs
293:, and
4687:Lists
4632:ADPCM
4627:µ-law
4622:A-law
4595:Lossy
4568:ACELP
4513:NETVC
4338:SMPTE
4300:T.802
4287:ITU-T
4263:(MP4)
4063:JBIG2
4026:ITU-T
3998:Image
3934:VSELP
3911:SVOPC
3901:Siren
3871:RCELP
3866:QCELP
3811:ATRAC
3796:ACELP
3613:Speex
3580:G.729
3575:G.728
3570:G.726
3560:G.723
3545:G.722
3540:G.719
3535:G.718
3528:µ-law
3523:A-law
3518:G.711
3510:ITU-T
3398:Audio
3272:Indeo
3252:Daala
3108:SMPTE
3083:H.263
3078:H.262
3073:H.261
3068:H.120
3056:ITU-T
2961:MJPEG
2928:Video
2214:The H
1296:(DOC)
984:Linux
980:POSIX
759:ACELP
751:Speex
736:libav
653:ATRAC
639:libav
625:is a
497:Nokia
365:SHA-1
219:codec
191:lossy
97:Audio
4714:See
4659:MDCT
4637:DPCM
4583:WLPC
4573:CELP
4476:RIFF
4454:WebM
4444:M2TS
4434:HEIF
4402:Bink
4382:AIFF
4310:IETF
4199:WebP
4194:WBMP
4189:QTVR
4169:ICER
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4154:DjVu
4144:AVIF
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4108:TIFF
4068:JPEG
4058:JBIG
4053:HEVC
4030:JPEG
4017:IETF
3984:LLAC
3979:LHDC
3974:LDAC
3954:aptX
3915:TTA
3896:SILK
3836:MELP
3831:Lyra
3826:iSAC
3816:CELT
3806:Asao
3801:ALAC
3779:ExAC
3774:L2HC
3704:AC-4
3699:AC-3
3691:ETSI
3656:EVRC
3633:3GPP
3623:FLAC
3608:iLBC
3603:Opus
3595:IETF
3418:MPEG
3384:YULS
3364:Thor
3312:4444
3262:FFV1
3242:Bink
3136:VC-6
3131:VC-5
3126:VC-3
3121:VC-2
3116:VC-1
3060:VCEG
2948:MPEG
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2657:CNET
2226:2011
2195:2011
2164:2011
2079:Bing
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550:and
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327:for
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177:and
165:and
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32:.wma
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4654:FFT
4649:DCT
4617:PCM
4610:LZW
4578:LSP
4563:LPC
4481:WAV
4439:IFF
4424:EVO
4414:BMP
4397:BPG
4387:AVI
4377:ASF
4372:AMV
4351:MXF
4346:GXF
4323:Ogg
4318:RTP
4226:IEC
4222:ISO
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4179:PGF
4174:MNG
4159:EXR
4149:BPG
4139:AV1
4103:PNG
4043:GIF
4022:W3C
4013:ISO
4009:IEC
3949:MQA
3944:WMA
3906:SMV
3891:SHN
3886:SD2
3861:OSQ
3846:MT9
3768:DRA
3732:LC3
3727:SBC
3709:DTS
3666:EVS
3641:AMR
3448:AAC
3413:IEC
3409:ISO
3379:XEB
3374:WMV
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3257:DVI
3237:AVS
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3180:VP9
3175:VP8
3170:VP7
3165:VP6
3160:VP3
2943:IEC
2939:ISO
1148:WAV
1130:Wii
901:EDN
897:DTS
891:At
884:At
879:MPC
858:At
842:At
823:At
816:At
633:by
524:AAC
454:AAC
427:kHz
408:WMA
361:RC4
357:DES
341:ID3
331:or
193:).
163:MP3
159:WMA
135:WMA
4736::
4600:LZ
4392:AU
4224:,
4028:,
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3369:Ut
3058:,
2956:DV
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963:,
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721:,
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